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Kingdom Subkingdom Phylum ANIMALIA Parazoa Porifera Symmetry Body Cavity Platyhelminthes Eumetazoa Nematoda Mollusca Annelida Arthropoda Echinodermata no symmetry Radial Bilateral Bilateral Bilateral Bilateral Bilateral Bilateral larva Adult radial none absent Acoelomate FALSE PseudoCoel. TRUE Coelomate Coelomate Coelomate Coelomate Organ-system Organ-system Organ-system Organ-system Organ-system Organ-system Development Protostome Protostome Protostome Protostome Protostome Deutrostome Segmentation absent absent unsegmented segmented segmented Exoskeleton completeDigSys paired, jointed appendages most insects have wings Organization No tissues Cnidaria none True tissues Characters 2 layers Choanocytes Spicules Filter-feeder many pores 2 layers Cnidocytes Polyp, Medusa only mouth Flat worms solid, 3-layered only mouth free living or parasitic Round worms complete DigSys no cilia live in soil or animal parasite soft-bodied complete DigSys may have shell head, foot and viseral mass rasping radula serially segment completeDigSys most have setae hydroskeleton Examples Grantia Hydra Physalia Jelly fish Sea Anemone Corals Planaria Flukes Tape worm Ascaris Snail Oyster Squid Octopus Neries Earthworm Leech Spiny-skinned Endoskeleton of bony plates water vascular system, tubefeet high regeneration Only marine Insect-butterfly Sea star Crustacea-crab Sea urchin millipede sea cucumber centipede brittle star spiders feather star scorpion Chordata Bilateral Coelomate Organ-system Deutrostome segmented Notochord dorsal nerve cord pharyngeal pouches have tail most with backbone gills or lungs Heart and vessels Lamprey sharks salmon, tuna frog, salamander lizard, turtle, alligator pigeon, sea-gull kangaroo, bat, rat